Examine source code of Push Client

{
  "name": "Push Client",
  "short_name": "Push Client",
  "version": "0.11.1",
  "description": "An extension that can send and receive pushes for the Pushover.net service",
  "browser_action": {
    "default_icon": "assets/144.png",
    "default_title": "Push Client",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "assets/16.png",
    "32": "assets/32.png",
    "96": "assets/96.png",
    "144": "assets/144.png",
    "192": "assets/192.png"
  },
  "options_ui": {
    "page": "index.html?options"
  },
  "background": {
    "scripts": [
      "background.js",
      "runtime.js"
    ],
    "persistent": true
  },
  "permissions": [
    "contextMenus",
    "storage",
    "notifications",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "manifest_version": 2
}